Studying the cores of ice can help us decode the climate of the past. Here’s how. First, let’s define ice core. An ice core is a cylindrical sample of ice drilled from a glacier. These provide the most direct and detailed way to identify past climates. Every year, it captures sediments such as dust and sea salts. It can even collect human pollutants. If we know what each layer of ice counts for in years, we can figure out the average temperature per year and see any recent climate events, such as a volcanic eruption. This technique is called dating. It uses things such as well-known volcanic eruptions. Peaks in Sulfate can be used to identify the input. In 1815, Krakatoa erupting causing the year without a summer. If we ever forget what